[native build] Use a single source of truth for NDK API levels

[grendello]

NOTE: #9926 must be merged first

[Copilot]

Pull request overview

This PR consolidates NDK API level definitions into a single source of truth in Configuration.props, eliminating hardcoded constants scattered across the build system. The PR introduces a new AndroidMinimumNonMonoApiLevel property (set to 24) for CoreCLR and NativeAOT runtimes, while maintaining the existing AndroidMinimumDotNetApiLevel (set to 21) for Mono-based runtimes.

Changes:

• Adds AndroidMinimumNonMonoApiLevel property (API 24) to Configuration.props for CoreCLR/NativeAOT runtimes
• Refactors XABuildConfig to use AndroidTargetArch-keyed dictionaries instead of string-based arch names
• Updates CMake presets to use runtime-specific configurations with distinct API levels for Mono vs non-Mono runtimes

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Configuration.props	Adds AndroidMinimumNonMonoApiLevel property (24) with documentation
build-tools/scripts/XABuildConfig.cs.in	Replaces string-keyed ArchAPILevels dictionary with two AndroidTargetArch-keyed dictionaries for Mono and non-Mono runtimes
build-tools/xaprepare/xaprepare/ConfigAndData/BuildAndroidPlatforms.cs	Converts NdkMinimum* constants to properties sourced from Context
build-tools/xaprepare/xaprepare/Application/KnownProperties.cs	Adds AndroidMinimumNonMonoApiLevel constant
build-tools/xaprepare/xaprepare/Application/Properties.Defaults.cs.in	Initializes AndroidMinimumNonMonoApiLevel property from template
build-tools/xaprepare/xaprepare/Steps/Step_GenerateFiles.cs	Adds placeholder replacements for non-Mono API levels
build-tools/xaprepare/xaprepare/Steps/Step_Android_SDK_NDK.cs	Updates to use string-based NdkMinimumAPI property
build-tools/xaprepare/xaprepare/xaprepare.targets	Adds AndroidMinimumNonMonoApiLevel replacement token
build-tools/scripts/xa_build_configuration.cmake.in	Removes unused 32-bit CoreCLR runtime directory variables
src/native/CMakeLists.txt	Removes unused 32-bit CoreCLR runtime directory definitions
src/native/CMakePresets.json.in	Adds nonmono-common-* presets with higher API levels and runtime-specific preset variants
src/native/native.targets	Adds _PresetPrefix logic to select runtime-specific CMake presets; removes NativeAOT debug output
src/Xamarin.Android.Build.Tasks/Utilities/NdkTools/*.cs	Updates GetMinimumApiLevelFor signature to accept AndroidRuntime parameter
src/Xamarin.Android.Build.Tasks/Utilities/MonoAndroidHelper.cs	Adds GetMinimumApiLevel helper method to select appropriate API level based on runtime
src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/Tasks/NdkUtilTests.cs	Updates test to parameterize by runtime and verify correct API levels
src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/Xamarin.Android.Build.Tests.csproj	Includes generated XABuildConfig.cs for test access

[Copilot]

@grendello I've opened a new pull request, #10764, to work on those changes. Once the pull request is ready, I'll request review from you.